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/drivers/acpi/thermal.c

https://bitbucket.org/wisechild/galaxy-nexus
C | 1180 lines | 920 code | 176 blank | 84 comment | 176 complexity | 90d007a34e8c5a2262b40118d55f59eb MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
   1/*
   2 *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3 *
   4 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6 *
   7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; either version 2 of the License, or (at
  12 *  your option) any later version.
  13 *
  14 *  This program is distributed in the hope that it will be useful, but
  15 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 *  General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License along
  20 *  with this program; if not, write to the Free Software Foundation, Inc.,
  21 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22 *
  23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24 *
  25 *  This driver fully implements the ACPI thermal policy as described in the
  26 *  ACPI 2.0 Specification.
  27 *
  28 *  TBD: 1. Implement passive cooling hysteresis.
  29 *       2. Enhance passive cooling (CPU) states/limit interface to support
  30 *          concepts of 'multiple limiters', upper/lower limits, etc.
  31 *
  32 */
  33
  34#include <linux/kernel.h>
  35#include <linux/module.h>
  36#include <linux/dmi.h>
  37#include <linux/init.h>
  38#include <linux/slab.h>
  39#include <linux/types.h>
  40#include <linux/jiffies.h>
  41#include <linux/kmod.h>
  42#include <linux/reboot.h>
  43#include <linux/device.h>
  44#include <asm/uaccess.h>
  45#include <linux/thermal.h>
  46#include <acpi/acpi_bus.h>
  47#include <acpi/acpi_drivers.h>
  48
  49#define PREFIX "ACPI: "
  50
  51#define ACPI_THERMAL_CLASS		"thermal_zone"
  52#define ACPI_THERMAL_DEVICE_NAME	"Thermal Zone"
  53#define ACPI_THERMAL_FILE_STATE		"state"
  54#define ACPI_THERMAL_FILE_TEMPERATURE	"temperature"
  55#define ACPI_THERMAL_FILE_TRIP_POINTS	"trip_points"
  56#define ACPI_THERMAL_FILE_COOLING_MODE	"cooling_mode"
  57#define ACPI_THERMAL_FILE_POLLING_FREQ	"polling_frequency"
  58#define ACPI_THERMAL_NOTIFY_TEMPERATURE	0x80
  59#define ACPI_THERMAL_NOTIFY_THRESHOLDS	0x81
  60#define ACPI_THERMAL_NOTIFY_DEVICES	0x82
  61#define ACPI_THERMAL_NOTIFY_CRITICAL	0xF0
  62#define ACPI_THERMAL_NOTIFY_HOT		0xF1
  63#define ACPI_THERMAL_MODE_ACTIVE	0x00
  64
  65#define ACPI_THERMAL_MAX_ACTIVE	10
  66#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68#define _COMPONENT		ACPI_THERMAL_COMPONENT
  69ACPI_MODULE_NAME("thermal");
  70
  71MODULE_AUTHOR("Paul Diefenbaugh");
  72MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  73MODULE_LICENSE("GPL");
  74
  75static int act;
  76module_param(act, int, 0644);
  77MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  78
  79static int crt;
  80module_param(crt, int, 0644);
  81MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  82
  83static int tzp;
  84module_param(tzp, int, 0444);
  85MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  86
  87static int nocrt;
  88module_param(nocrt, int, 0);
  89MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  90
  91static int off;
  92module_param(off, int, 0);
  93MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  94
  95static int psv;
  96module_param(psv, int, 0644);
  97MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  98
  99static int acpi_thermal_add(struct acpi_device *device);
 100static int acpi_thermal_remove(struct acpi_device *device, int type);
 101static int acpi_thermal_resume(struct acpi_device *device);
 102static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 103
 104static const struct acpi_device_id  thermal_device_ids[] = {
 105	{ACPI_THERMAL_HID, 0},
 106	{"", 0},
 107};
 108MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 109
 110static struct acpi_driver acpi_thermal_driver = {
 111	.name = "thermal",
 112	.class = ACPI_THERMAL_CLASS,
 113	.ids = thermal_device_ids,
 114	.ops = {
 115		.add = acpi_thermal_add,
 116		.remove = acpi_thermal_remove,
 117		.resume = acpi_thermal_resume,
 118		.notify = acpi_thermal_notify,
 119		},
 120};
 121
 122struct acpi_thermal_state {
 123	u8 critical:1;
 124	u8 hot:1;
 125	u8 passive:1;
 126	u8 active:1;
 127	u8 reserved:4;
 128	int active_index;
 129};
 130
 131struct acpi_thermal_state_flags {
 132	u8 valid:1;
 133	u8 enabled:1;
 134	u8 reserved:6;
 135};
 136
 137struct acpi_thermal_critical {
 138	struct acpi_thermal_state_flags flags;
 139	unsigned long temperature;
 140};
 141
 142struct acpi_thermal_hot {
 143	struct acpi_thermal_state_flags flags;
 144	unsigned long temperature;
 145};
 146
 147struct acpi_thermal_passive {
 148	struct acpi_thermal_state_flags flags;
 149	unsigned long temperature;
 150	unsigned long tc1;
 151	unsigned long tc2;
 152	unsigned long tsp;
 153	struct acpi_handle_list devices;
 154};
 155
 156struct acpi_thermal_active {
 157	struct acpi_thermal_state_flags flags;
 158	unsigned long temperature;
 159	struct acpi_handle_list devices;
 160};
 161
 162struct acpi_thermal_trips {
 163	struct acpi_thermal_critical critical;
 164	struct acpi_thermal_hot hot;
 165	struct acpi_thermal_passive passive;
 166	struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 167};
 168
 169struct acpi_thermal_flags {
 170	u8 cooling_mode:1;	/* _SCP */
 171	u8 devices:1;		/* _TZD */
 172	u8 reserved:6;
 173};
 174
 175struct acpi_thermal {
 176	struct acpi_device * device;
 177	acpi_bus_id name;
 178	unsigned long temperature;
 179	unsigned long last_temperature;
 180	unsigned long polling_frequency;
 181	volatile u8 zombie;
 182	struct acpi_thermal_flags flags;
 183	struct acpi_thermal_state state;
 184	struct acpi_thermal_trips trips;
 185	struct acpi_handle_list devices;
 186	struct thermal_zone_device *thermal_zone;
 187	int tz_enabled;
 188	int kelvin_offset;
 189	struct mutex lock;
 190};
 191
 192/* --------------------------------------------------------------------------
 193                             Thermal Zone Management
 194   -------------------------------------------------------------------------- */
 195
 196static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 197{
 198	acpi_status status = AE_OK;
 199	unsigned long long tmp;
 200
 201	if (!tz)
 202		return -EINVAL;
 203
 204	tz->last_temperature = tz->temperature;
 205
 206	status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 207	if (ACPI_FAILURE(status))
 208		return -ENODEV;
 209
 210	tz->temperature = tmp;
 211	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 212			  tz->temperature));
 213
 214	return 0;
 215}
 216
 217static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 218{
 219	acpi_status status = AE_OK;
 220	unsigned long long tmp;
 221
 222	if (!tz)
 223		return -EINVAL;
 224
 225	status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 226	if (ACPI_FAILURE(status))
 227		return -ENODEV;
 228
 229	tz->polling_frequency = tmp;
 230	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 231			  tz->polling_frequency));
 232
 233	return 0;
 234}
 235
 236static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 237{
 238	acpi_status status = AE_OK;
 239	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 240	struct acpi_object_list arg_list = { 1, &arg0 };
 241	acpi_handle handle = NULL;
 242
 243
 244	if (!tz)
 245		return -EINVAL;
 246
 247	status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 248	if (ACPI_FAILURE(status)) {
 249		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 250		return -ENODEV;
 251	}
 252
 253	arg0.integer.value = mode;
 254
 255	status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 256	if (ACPI_FAILURE(status))
 257		return -ENODEV;
 258
 259	return 0;
 260}
 261
 262#define ACPI_TRIPS_CRITICAL	0x01
 263#define ACPI_TRIPS_HOT		0x02
 264#define ACPI_TRIPS_PASSIVE	0x04
 265#define ACPI_TRIPS_ACTIVE	0x08
 266#define ACPI_TRIPS_DEVICES	0x10
 267
 268#define ACPI_TRIPS_REFRESH_THRESHOLDS	(ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 269#define ACPI_TRIPS_REFRESH_DEVICES	ACPI_TRIPS_DEVICES
 270
 271#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |	\
 272			      ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |	\
 273			      ACPI_TRIPS_DEVICES)
 274
 275/*
 276 * This exception is thrown out in two cases:
 277 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 278 *   when re-evaluating the AML code.
 279 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 280 *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 281 */
 282#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)	\
 283do {	\
 284	if (flags != ACPI_TRIPS_INIT)	\
 285		ACPI_EXCEPTION((AE_INFO, AE_ERROR,	\
 286		"ACPI thermal trip point %s changed\n"	\
 287		"Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 288} while (0)
 289
 290static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 291{
 292	acpi_status status = AE_OK;
 293	unsigned long long tmp;
 294	struct acpi_handle_list devices;
 295	int valid = 0;
 296	int i;
 297
 298	/* Critical Shutdown */
 299	if (flag & ACPI_TRIPS_CRITICAL) {
 300		status = acpi_evaluate_integer(tz->device->handle,
 301				"_CRT", NULL, &tmp);
 302		tz->trips.critical.temperature = tmp;
 303		/*
 304		 * Treat freezing temperatures as invalid as well; some
 305		 * BIOSes return really low values and cause reboots at startup.
 306		 * Below zero (Celsius) values clearly aren't right for sure..
 307		 * ... so lets discard those as invalid.
 308		 */
 309		if (ACPI_FAILURE(status)) {
 310			tz->trips.critical.flags.valid = 0;
 311			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 312					  "No critical threshold\n"));
 313		} else if (tmp <= 2732) {
 314			printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 315			       "(%llu)\n", tmp);
 316			tz->trips.critical.flags.valid = 0;
 317		} else {
 318			tz->trips.critical.flags.valid = 1;
 319			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 320					  "Found critical threshold [%lu]\n",
 321					  tz->trips.critical.temperature));
 322		}
 323		if (tz->trips.critical.flags.valid == 1) {
 324			if (crt == -1) {
 325				tz->trips.critical.flags.valid = 0;
 326			} else if (crt > 0) {
 327				unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 328				/*
 329				 * Allow override critical threshold
 330				 */
 331				if (crt_k > tz->trips.critical.temperature)
 332					printk(KERN_WARNING PREFIX
 333						"Critical threshold %d C\n", crt);
 334				tz->trips.critical.temperature = crt_k;
 335			}
 336		}
 337	}
 338
 339	/* Critical Sleep (optional) */
 340	if (flag & ACPI_TRIPS_HOT) {
 341		status = acpi_evaluate_integer(tz->device->handle,
 342				"_HOT", NULL, &tmp);
 343		if (ACPI_FAILURE(status)) {
 344			tz->trips.hot.flags.valid = 0;
 345			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 346					"No hot threshold\n"));
 347		} else {
 348			tz->trips.hot.temperature = tmp;
 349			tz->trips.hot.flags.valid = 1;
 350			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 351					"Found hot threshold [%lu]\n",
 352					tz->trips.critical.temperature));
 353		}
 354	}
 355
 356	/* Passive (optional) */
 357	if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 358		(flag == ACPI_TRIPS_INIT)) {
 359		valid = tz->trips.passive.flags.valid;
 360		if (psv == -1) {
 361			status = AE_SUPPORT;
 362		} else if (psv > 0) {
 363			tmp = CELSIUS_TO_KELVIN(psv);
 364			status = AE_OK;
 365		} else {
 366			status = acpi_evaluate_integer(tz->device->handle,
 367				"_PSV", NULL, &tmp);
 368		}
 369
 370		if (ACPI_FAILURE(status))
 371			tz->trips.passive.flags.valid = 0;
 372		else {
 373			tz->trips.passive.temperature = tmp;
 374			tz->trips.passive.flags.valid = 1;
 375			if (flag == ACPI_TRIPS_INIT) {
 376				status = acpi_evaluate_integer(
 377						tz->device->handle, "_TC1",
 378						NULL, &tmp);
 379				if (ACPI_FAILURE(status))
 380					tz->trips.passive.flags.valid = 0;
 381				else
 382					tz->trips.passive.tc1 = tmp;
 383				status = acpi_evaluate_integer(
 384						tz->device->handle, "_TC2",
 385						NULL, &tmp);
 386				if (ACPI_FAILURE(status))
 387					tz->trips.passive.flags.valid = 0;
 388				else
 389					tz->trips.passive.tc2 = tmp;
 390				status = acpi_evaluate_integer(
 391						tz->device->handle, "_TSP",
 392						NULL, &tmp);
 393				if (ACPI_FAILURE(status))
 394					tz->trips.passive.flags.valid = 0;
 395				else
 396					tz->trips.passive.tsp = tmp;
 397			}
 398		}
 399	}
 400	if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 401		memset(&devices, 0, sizeof(struct acpi_handle_list));
 402		status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 403							NULL, &devices);
 404		if (ACPI_FAILURE(status)) {
 405			printk(KERN_WARNING PREFIX
 406				"Invalid passive threshold\n");
 407			tz->trips.passive.flags.valid = 0;
 408		}
 409		else
 410			tz->trips.passive.flags.valid = 1;
 411
 412		if (memcmp(&tz->trips.passive.devices, &devices,
 413				sizeof(struct acpi_handle_list))) {
 414			memcpy(&tz->trips.passive.devices, &devices,
 415				sizeof(struct acpi_handle_list));
 416			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 417		}
 418	}
 419	if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 420		if (valid != tz->trips.passive.flags.valid)
 421				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 422	}
 423
 424	/* Active (optional) */
 425	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 426		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 427		valid = tz->trips.active[i].flags.valid;
 428
 429		if (act == -1)
 430			break; /* disable all active trip points */
 431
 432		if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 433			tz->trips.active[i].flags.valid)) {
 434			status = acpi_evaluate_integer(tz->device->handle,
 435							name, NULL, &tmp);
 436			if (ACPI_FAILURE(status)) {
 437				tz->trips.active[i].flags.valid = 0;
 438				if (i == 0)
 439					break;
 440				if (act <= 0)
 441					break;
 442				if (i == 1)
 443					tz->trips.active[0].temperature =
 444						CELSIUS_TO_KELVIN(act);
 445				else
 446					/*
 447					 * Don't allow override higher than
 448					 * the next higher trip point
 449					 */
 450					tz->trips.active[i - 1].temperature =
 451						(tz->trips.active[i - 2].temperature <
 452						CELSIUS_TO_KELVIN(act) ?
 453						tz->trips.active[i - 2].temperature :
 454						CELSIUS_TO_KELVIN(act));
 455				break;
 456			} else {
 457				tz->trips.active[i].temperature = tmp;
 458				tz->trips.active[i].flags.valid = 1;
 459			}
 460		}
 461
 462		name[2] = 'L';
 463		if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 464			memset(&devices, 0, sizeof(struct acpi_handle_list));
 465			status = acpi_evaluate_reference(tz->device->handle,
 466						name, NULL, &devices);
 467			if (ACPI_FAILURE(status)) {
 468				printk(KERN_WARNING PREFIX
 469					"Invalid active%d threshold\n", i);
 470				tz->trips.active[i].flags.valid = 0;
 471			}
 472			else
 473				tz->trips.active[i].flags.valid = 1;
 474
 475			if (memcmp(&tz->trips.active[i].devices, &devices,
 476					sizeof(struct acpi_handle_list))) {
 477				memcpy(&tz->trips.active[i].devices, &devices,
 478					sizeof(struct acpi_handle_list));
 479				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 480			}
 481		}
 482		if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 483			if (valid != tz->trips.active[i].flags.valid)
 484				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 485
 486		if (!tz->trips.active[i].flags.valid)
 487			break;
 488	}
 489
 490	if (flag & ACPI_TRIPS_DEVICES) {
 491		memset(&devices, 0, sizeof(struct acpi_handle_list));
 492		status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 493						NULL, &devices);
 494		if (memcmp(&tz->devices, &devices,
 495				sizeof(struct acpi_handle_list))) {
 496			memcpy(&tz->devices, &devices,
 497				sizeof(struct acpi_handle_list));
 498			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 499		}
 500	}
 501
 502	return 0;
 503}
 504
 505static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 506{
 507	int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 508
 509	if (ret)
 510		return ret;
 511
 512	valid = tz->trips.critical.flags.valid |
 513		tz->trips.hot.flags.valid |
 514		tz->trips.passive.flags.valid;
 515
 516	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 517		valid |= tz->trips.active[i].flags.valid;
 518
 519	if (!valid) {
 520		printk(KERN_WARNING FW_BUG "No valid trip found\n");
 521		return -ENODEV;
 522	}
 523	return 0;
 524}
 525
 526static void acpi_thermal_check(void *data)
 527{
 528	struct acpi_thermal *tz = data;
 529
 530	thermal_zone_device_update(tz->thermal_zone);
 531}
 532
 533/* sys I/F for generic thermal sysfs support */
 534#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 535
 536static int thermal_get_temp(struct thermal_zone_device *thermal,
 537			    unsigned long *temp)
 538{
 539	struct acpi_thermal *tz = thermal->devdata;
 540	int result;
 541
 542	if (!tz)
 543		return -EINVAL;
 544
 545	result = acpi_thermal_get_temperature(tz);
 546	if (result)
 547		return result;
 548
 549	*temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 550	return 0;
 551}
 552
 553static const char enabled[] = "kernel";
 554static const char disabled[] = "user";
 555static int thermal_get_mode(struct thermal_zone_device *thermal,
 556				enum thermal_device_mode *mode)
 557{
 558	struct acpi_thermal *tz = thermal->devdata;
 559
 560	if (!tz)
 561		return -EINVAL;
 562
 563	*mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 564		THERMAL_DEVICE_DISABLED;
 565
 566	return 0;
 567}
 568
 569static int thermal_set_mode(struct thermal_zone_device *thermal,
 570				enum thermal_device_mode mode)
 571{
 572	struct acpi_thermal *tz = thermal->devdata;
 573	int enable;
 574
 575	if (!tz)
 576		return -EINVAL;
 577
 578	/*
 579	 * enable/disable thermal management from ACPI thermal driver
 580	 */
 581	if (mode == THERMAL_DEVICE_ENABLED)
 582		enable = 1;
 583	else if (mode == THERMAL_DEVICE_DISABLED)
 584		enable = 0;
 585	else
 586		return -EINVAL;
 587
 588	if (enable != tz->tz_enabled) {
 589		tz->tz_enabled = enable;
 590		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 591			"%s ACPI thermal control\n",
 592			tz->tz_enabled ? enabled : disabled));
 593		acpi_thermal_check(tz);
 594	}
 595	return 0;
 596}
 597
 598static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 599				 int trip, enum thermal_trip_type *type)
 600{
 601	struct acpi_thermal *tz = thermal->devdata;
 602	int i;
 603
 604	if (!tz || trip < 0)
 605		return -EINVAL;
 606
 607	if (tz->trips.critical.flags.valid) {
 608		if (!trip) {
 609			*type = THERMAL_TRIP_CRITICAL;
 610			return 0;
 611		}
 612		trip--;
 613	}
 614
 615	if (tz->trips.hot.flags.valid) {
 616		if (!trip) {
 617			*type = THERMAL_TRIP_HOT;
 618			return 0;
 619		}
 620		trip--;
 621	}
 622
 623	if (tz->trips.passive.flags.valid) {
 624		if (!trip) {
 625			*type = THERMAL_TRIP_PASSIVE;
 626			return 0;
 627		}
 628		trip--;
 629	}
 630
 631	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 632		tz->trips.active[i].flags.valid; i++) {
 633		if (!trip) {
 634			*type = THERMAL_TRIP_ACTIVE;
 635			return 0;
 636		}
 637		trip--;
 638	}
 639
 640	return -EINVAL;
 641}
 642
 643static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 644				 int trip, unsigned long *temp)
 645{
 646	struct acpi_thermal *tz = thermal->devdata;
 647	int i;
 648
 649	if (!tz || trip < 0)
 650		return -EINVAL;
 651
 652	if (tz->trips.critical.flags.valid) {
 653		if (!trip) {
 654			*temp = KELVIN_TO_MILLICELSIUS(
 655				tz->trips.critical.temperature,
 656				tz->kelvin_offset);
 657			return 0;
 658		}
 659		trip--;
 660	}
 661
 662	if (tz->trips.hot.flags.valid) {
 663		if (!trip) {
 664			*temp = KELVIN_TO_MILLICELSIUS(
 665				tz->trips.hot.temperature,
 666				tz->kelvin_offset);
 667			return 0;
 668		}
 669		trip--;
 670	}
 671
 672	if (tz->trips.passive.flags.valid) {
 673		if (!trip) {
 674			*temp = KELVIN_TO_MILLICELSIUS(
 675				tz->trips.passive.temperature,
 676				tz->kelvin_offset);
 677			return 0;
 678		}
 679		trip--;
 680	}
 681
 682	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 683		tz->trips.active[i].flags.valid; i++) {
 684		if (!trip) {
 685			*temp = KELVIN_TO_MILLICELSIUS(
 686				tz->trips.active[i].temperature,
 687				tz->kelvin_offset);
 688			return 0;
 689		}
 690		trip--;
 691	}
 692
 693	return -EINVAL;
 694}
 695
 696static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 697				unsigned long *temperature) {
 698	struct acpi_thermal *tz = thermal->devdata;
 699
 700	if (tz->trips.critical.flags.valid) {
 701		*temperature = KELVIN_TO_MILLICELSIUS(
 702				tz->trips.critical.temperature,
 703				tz->kelvin_offset);
 704		return 0;
 705	} else
 706		return -EINVAL;
 707}
 708
 709static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 710			   enum thermal_trip_type trip_type)
 711{
 712	u8 type = 0;
 713	struct acpi_thermal *tz = thermal->devdata;
 714
 715	if (trip_type == THERMAL_TRIP_CRITICAL)
 716		type = ACPI_THERMAL_NOTIFY_CRITICAL;
 717	else if (trip_type == THERMAL_TRIP_HOT)
 718		type = ACPI_THERMAL_NOTIFY_HOT;
 719	else
 720		return 0;
 721
 722	acpi_bus_generate_proc_event(tz->device, type, 1);
 723	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 724					dev_name(&tz->device->dev), type, 1);
 725
 726	if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 727		return 1;
 728
 729	return 0;
 730}
 731
 732typedef int (*cb)(struct thermal_zone_device *, int,
 733		  struct thermal_cooling_device *);
 734static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 735					struct thermal_cooling_device *cdev,
 736					cb action)
 737{
 738	struct acpi_device *device = cdev->devdata;
 739	struct acpi_thermal *tz = thermal->devdata;
 740	struct acpi_device *dev;
 741	acpi_status status;
 742	acpi_handle handle;
 743	int i;
 744	int j;
 745	int trip = -1;
 746	int result = 0;
 747
 748	if (tz->trips.critical.flags.valid)
 749		trip++;
 750
 751	if (tz->trips.hot.flags.valid)
 752		trip++;
 753
 754	if (tz->trips.passive.flags.valid) {
 755		trip++;
 756		for (i = 0; i < tz->trips.passive.devices.count;
 757		    i++) {
 758			handle = tz->trips.passive.devices.handles[i];
 759			status = acpi_bus_get_device(handle, &dev);
 760			if (ACPI_SUCCESS(status) && (dev == device)) {
 761				result = action(thermal, trip, cdev);
 762				if (result)
 763					goto failed;
 764			}
 765		}
 766	}
 767
 768	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 769		if (!tz->trips.active[i].flags.valid)
 770			break;
 771		trip++;
 772		for (j = 0;
 773		    j < tz->trips.active[i].devices.count;
 774		    j++) {
 775			handle = tz->trips.active[i].devices.handles[j];
 776			status = acpi_bus_get_device(handle, &dev);
 777			if (ACPI_SUCCESS(status) && (dev == device)) {
 778				result = action(thermal, trip, cdev);
 779				if (result)
 780					goto failed;
 781			}
 782		}
 783	}
 784
 785	for (i = 0; i < tz->devices.count; i++) {
 786		handle = tz->devices.handles[i];
 787		status = acpi_bus_get_device(handle, &dev);
 788		if (ACPI_SUCCESS(status) && (dev == device)) {
 789			result = action(thermal, -1, cdev);
 790			if (result)
 791				goto failed;
 792		}
 793	}
 794
 795failed:
 796	return result;
 797}
 798
 799static int
 800acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 801					struct thermal_cooling_device *cdev)
 802{
 803	return acpi_thermal_cooling_device_cb(thermal, cdev,
 804				thermal_zone_bind_cooling_device);
 805}
 806
 807static int
 808acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 809					struct thermal_cooling_device *cdev)
 810{
 811	return acpi_thermal_cooling_device_cb(thermal, cdev,
 812				thermal_zone_unbind_cooling_device);
 813}
 814
 815static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 816	.bind = acpi_thermal_bind_cooling_device,
 817	.unbind	= acpi_thermal_unbind_cooling_device,
 818	.get_temp = thermal_get_temp,
 819	.get_mode = thermal_get_mode,
 820	.set_mode = thermal_set_mode,
 821	.get_trip_type = thermal_get_trip_type,
 822	.get_trip_temp = thermal_get_trip_temp,
 823	.get_crit_temp = thermal_get_crit_temp,
 824	.notify = thermal_notify,
 825};
 826
 827static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 828{
 829	int trips = 0;
 830	int result;
 831	acpi_status status;
 832	int i;
 833
 834	if (tz->trips.critical.flags.valid)
 835		trips++;
 836
 837	if (tz->trips.hot.flags.valid)
 838		trips++;
 839
 840	if (tz->trips.passive.flags.valid)
 841		trips++;
 842
 843	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 844			tz->trips.active[i].flags.valid; i++, trips++);
 845
 846	if (tz->trips.passive.flags.valid)
 847		tz->thermal_zone =
 848			thermal_zone_device_register("acpitz", trips, tz,
 849						     &acpi_thermal_zone_ops,
 850						     tz->trips.passive.tc1,
 851						     tz->trips.passive.tc2,
 852						     tz->trips.passive.tsp*100,
 853						     tz->polling_frequency*100);
 854	else
 855		tz->thermal_zone =
 856			thermal_zone_device_register("acpitz", trips, tz,
 857						     &acpi_thermal_zone_ops,
 858						     0, 0, 0,
 859						     tz->polling_frequency*100);
 860	if (IS_ERR(tz->thermal_zone))
 861		return -ENODEV;
 862
 863	result = sysfs_create_link(&tz->device->dev.kobj,
 864				   &tz->thermal_zone->device.kobj, "thermal_zone");
 865	if (result)
 866		return result;
 867
 868	result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 869				   &tz->device->dev.kobj, "device");
 870	if (result)
 871		return result;
 872
 873	status = acpi_attach_data(tz->device->handle,
 874				  acpi_bus_private_data_handler,
 875				  tz->thermal_zone);
 876	if (ACPI_FAILURE(status)) {
 877		printk(KERN_ERR PREFIX
 878				"Error attaching device data\n");
 879		return -ENODEV;
 880	}
 881
 882	tz->tz_enabled = 1;
 883
 884	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 885		 tz->thermal_zone->id);
 886	return 0;
 887}
 888
 889static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 890{
 891	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 892	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 893	thermal_zone_device_unregister(tz->thermal_zone);
 894	tz->thermal_zone = NULL;
 895	acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 896}
 897
 898
 899/* --------------------------------------------------------------------------
 900                                 Driver Interface
 901   -------------------------------------------------------------------------- */
 902
 903static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 904{
 905	struct acpi_thermal *tz = acpi_driver_data(device);
 906
 907
 908	if (!tz)
 909		return;
 910
 911	switch (event) {
 912	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 913		acpi_thermal_check(tz);
 914		break;
 915	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 916		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 917		acpi_thermal_check(tz);
 918		acpi_bus_generate_proc_event(device, event, 0);
 919		acpi_bus_generate_netlink_event(device->pnp.device_class,
 920						  dev_name(&device->dev), event, 0);
 921		break;
 922	case ACPI_THERMAL_NOTIFY_DEVICES:
 923		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 924		acpi_thermal_check(tz);
 925		acpi_bus_generate_proc_event(device, event, 0);
 926		acpi_bus_generate_netlink_event(device->pnp.device_class,
 927						  dev_name(&device->dev), event, 0);
 928		break;
 929	default:
 930		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 931				  "Unsupported event [0x%x]\n", event));
 932		break;
 933	}
 934}
 935
 936static int acpi_thermal_get_info(struct acpi_thermal *tz)
 937{
 938	int result = 0;
 939
 940
 941	if (!tz)
 942		return -EINVAL;
 943
 944	/* Get temperature [_TMP] (required) */
 945	result = acpi_thermal_get_temperature(tz);
 946	if (result)
 947		return result;
 948
 949	/* Get trip points [_CRT, _PSV, etc.] (required) */
 950	result = acpi_thermal_get_trip_points(tz);
 951	if (result)
 952		return result;
 953
 954	/* Set the cooling mode [_SCP] to active cooling (default) */
 955	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
 956	if (!result)
 957		tz->flags.cooling_mode = 1;
 958
 959	/* Get default polling frequency [_TZP] (optional) */
 960	if (tzp)
 961		tz->polling_frequency = tzp;
 962	else
 963		acpi_thermal_get_polling_frequency(tz);
 964
 965	return 0;
 966}
 967
 968/*
 969 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
 970 * handles temperature values with a single decimal place. As a consequence,
 971 * some implementations use an offset of 273.1 and others use an offset of
 972 * 273.2. Try to find out which one is being used, to present the most
 973 * accurate and visually appealing number.
 974 *
 975 * The heuristic below should work for all ACPI thermal zones which have a
 976 * critical trip point with a value being a multiple of 0.5 degree Celsius.
 977 */
 978static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
 979{
 980	if (tz->trips.critical.flags.valid &&
 981	    (tz->trips.critical.temperature % 5) == 1)
 982		tz->kelvin_offset = 2731;
 983	else
 984		tz->kelvin_offset = 2732;
 985}
 986
 987static int acpi_thermal_add(struct acpi_device *device)
 988{
 989	int result = 0;
 990	struct acpi_thermal *tz = NULL;
 991
 992
 993	if (!device)
 994		return -EINVAL;
 995
 996	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
 997	if (!tz)
 998		return -ENOMEM;
 999
1000	tz->device = device;
1001	strcpy(tz->name, device->pnp.bus_id);
1002	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1003	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1004	device->driver_data = tz;
1005	mutex_init(&tz->lock);
1006
1007
1008	result = acpi_thermal_get_info(tz);
1009	if (result)
1010		goto free_memory;
1011
1012	acpi_thermal_guess_offset(tz);
1013
1014	result = acpi_thermal_register_thermal_zone(tz);
1015	if (result)
1016		goto free_memory;
1017
1018	printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1019	       acpi_device_name(device), acpi_device_bid(device),
1020	       KELVIN_TO_CELSIUS(tz->temperature));
1021	goto end;
1022
1023free_memory:
1024	kfree(tz);
1025end:
1026	return result;
1027}
1028
1029static int acpi_thermal_remove(struct acpi_device *device, int type)
1030{
1031	struct acpi_thermal *tz = NULL;
1032
1033	if (!device || !acpi_driver_data(device))
1034		return -EINVAL;
1035
1036	tz = acpi_driver_data(device);
1037
1038	acpi_thermal_unregister_thermal_zone(tz);
1039	mutex_destroy(&tz->lock);
1040	kfree(tz);
1041	return 0;
1042}
1043
1044static int acpi_thermal_resume(struct acpi_device *device)
1045{
1046	struct acpi_thermal *tz = NULL;
1047	int i, j, power_state, result;
1048
1049
1050	if (!device || !acpi_driver_data(device))
1051		return -EINVAL;
1052
1053	tz = acpi_driver_data(device);
1054
1055	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1056		if (!(&tz->trips.active[i]))
1057			break;
1058		if (!tz->trips.active[i].flags.valid)
1059			break;
1060		tz->trips.active[i].flags.enabled = 1;
1061		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1062			result = acpi_bus_update_power(
1063					tz->trips.active[i].devices.handles[j],
1064					&power_state);
1065			if (result || (power_state != ACPI_STATE_D0)) {
1066				tz->trips.active[i].flags.enabled = 0;
1067				break;
1068			}
1069		}
1070		tz->state.active |= tz->trips.active[i].flags.enabled;
1071	}
1072
1073	acpi_thermal_check(tz);
1074
1075	return AE_OK;
1076}
1077
1078static int thermal_act(const struct dmi_system_id *d) {
1079
1080	if (act == 0) {
1081		printk(KERN_NOTICE "ACPI: %s detected: "
1082			"disabling all active thermal trip points\n", d->ident);
1083		act = -1;
1084	}
1085	return 0;
1086}
1087static int thermal_nocrt(const struct dmi_system_id *d) {
1088
1089	printk(KERN_NOTICE "ACPI: %s detected: "
1090		"disabling all critical thermal trip point actions.\n", d->ident);
1091	nocrt = 1;
1092	return 0;
1093}
1094static int thermal_tzp(const struct dmi_system_id *d) {
1095
1096	if (tzp == 0) {
1097		printk(KERN_NOTICE "ACPI: %s detected: "
1098			"enabling thermal zone polling\n", d->ident);
1099		tzp = 300;	/* 300 dS = 30 Seconds */
1100	}
1101	return 0;
1102}
1103static int thermal_psv(const struct dmi_system_id *d) {
1104
1105	if (psv == 0) {
1106		printk(KERN_NOTICE "ACPI: %s detected: "
1107			"disabling all passive thermal trip points\n", d->ident);
1108		psv = -1;
1109	}
1110	return 0;
1111}
1112
1113static struct dmi_system_id thermal_dmi_table[] __initdata = {
1114	/*
1115	 * Award BIOS on this AOpen makes thermal control almost worthless.
1116	 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1117	 */
1118	{
1119	 .callback = thermal_act,
1120	 .ident = "AOpen i915GMm-HFS",
1121	 .matches = {
1122		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1123		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1124		},
1125	},
1126	{
1127	 .callback = thermal_psv,
1128	 .ident = "AOpen i915GMm-HFS",
1129	 .matches = {
1130		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1131		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1132		},
1133	},
1134	{
1135	 .callback = thermal_tzp,
1136	 .ident = "AOpen i915GMm-HFS",
1137	 .matches = {
1138		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1139		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1140		},
1141	},
1142	{
1143	 .callback = thermal_nocrt,
1144	 .ident = "Gigabyte GA-7ZX",
1145	 .matches = {
1146		DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1147		DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1148		},
1149	},
1150	{}
1151};
1152
1153static int __init acpi_thermal_init(void)
1154{
1155	int result = 0;
1156
1157	dmi_check_system(thermal_dmi_table);
1158
1159	if (off) {
1160		printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1161		return -ENODEV;
1162	}
1163
1164	result = acpi_bus_register_driver(&acpi_thermal_driver);
1165	if (result < 0)
1166		return -ENODEV;
1167
1168	return 0;
1169}
1170
1171static void __exit acpi_thermal_exit(void)
1172{
1173
1174	acpi_bus_unregister_driver(&acpi_thermal_driver);
1175
1176	return;
1177}
1178
1179module_init(acpi_thermal_init);
1180module_exit(acpi_thermal_exit);